package servlet;

import pojo.User;
import service.UserService;
import service.impl.UserServiceImpl;
import util.Page;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

@WebServlet(urlPatterns = {"/user"})
public class UserServlet extends HttpServlet {
    UserService userService = new UserServiceImpl();
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
       doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        UserService userService = new UserServiceImpl();
        req.setCharacterEncoding("utf-8");
        String action=req.getParameter("action");
        if("list".equals(action)){
            //创建业务层对象  多态
            String name=req.getParameter("name");
            String pass=req.getParameter("pass");
            String currentPage=req.getParameter("currentPage");
            if(currentPage==null){
                currentPage="1";
            }
            int int_currentPage=Integer.parseInt(currentPage);
            Page page=new Page();
            User condition=new User(name,pass);
            //查询总记录数
            int totalCount=userService.count(condition);
            page.setTotalCount(totalCount);
            page.setCurrentPage(int_currentPage);
            page.setTotalPage();

            //计算偏移量
            int offset=(int_currentPage-1)*page.getPageSize();



            List<User> users=userService.findAll(condition,offset,page.getPageSize());

            req.setAttribute("conditon",condition);
            req.setAttribute("page",page);
            //把集合中数据存储到作用域中
            req.setAttribute("users",users);
            //打开页面
            req.getRequestDispatcher("/list.jsp").forward(req,resp);

        }else if("add".equals(action)){
            //拿到页面传递的参数
            String name=req.getParameter("name");
            String pass=req.getParameter("pass");
            int result=userService.addUser(new User(name,pass));
            if(result>0){
                resp.sendRedirect("user?action=list");

            }else {
                resp.sendRedirect("/add.jsp");
            }

        }else if("delete".equals(action)){
            //拿到页面传递的参数
            String sid=req.getParameter("id");
            Integer id=Integer.parseInt(sid);
            //根据id查询用户信息
            int result = userService.deleteUserById(id);

            if (result>0){
                //重定向到查询所用用户的界面
                resp.sendRedirect("user?action=list");
            }else {
                resp.sendRedirect("/delete.jsp");
            }
        }else if("toupdate".equals(action)){
            //拿到页面传递的参数
            String sid=req.getParameter("id");
            Integer id=Integer.parseInt(sid);
            //根据id查询用户信息
            User user = userService.findById(id);

            //将对象存储在作用域中
            req.setAttribute("user",user);
            req.getRequestDispatcher("/update.jsp").forward(req,resp);
        }else if("update".equals(action)){
            //获取界面隐藏的id
            String sid=req.getParameter("id");
            Integer id=Integer.parseInt(sid);
            //拿到页面传递的参数
            String name=req.getParameter("name");
            String pass=req.getParameter("pass");

            int result=userService.updateUser(new User(id,name,pass));

            if (result > 0) {
                // 重定向
                resp.sendRedirect("user?action=list");
            } else {
            }

        }


    }
}
